Recent content by Johnae

But there is no oxygen...

Thanks Ed, The pH is 12. How about 2205 DSS. Is it OK in this service?

We are designing a waste water disposal system. High Cl (32,000ppm), High TDS and operating temperature (100 degree C). What exchanger materials would you suggest? Waste water is on the tubeside.

Thanks.

What tank internal coating material would you recommend if tank operating temperature is higher than 100 C. This is waste water tank with high chloride content. Thanks.

Hi, How about if temperature goes to 100 degree C? What tank material we should use? Thanks.

Again, it is in wet H2S service and with microalloy elements Nb and V.

Yes ,I am talking about SA516-70. Some users report if PWHT temperature is higher than 1175F, the tensile strength and toughness will decrease a lot. I want to persuade people to use 1175 or higher temperature for PWHT, but I need more information and evidence.

The 1100-1200 deg F band that I stated comes from ASME code. If It is not entirely correct what codes or papers I should refer since I cannot do any test?

The PWHT temperature specified for carbon steels ranges from 1100 F to 1200 F per ASME VIII. Some users have reported it necessary to use the 1175 F or higher PWHT temperature when the steel contains intentional additions of microalloying elements, such as Nb and V, in order to achieve HAZ...

Sorry, metengr, I meant reheat cracking. I think TiC precipitate in 321 has same function with NbC precipitate in 347, strengthening grains and causing grain boundaries tearing when cooling. Also, both of them can serve as stabilizing elements to tie up carbon and avoid CrC formation.

Hello, I am trying to find out some differences between Titanium stabilized stainless steel (321, 316Ti) and Niobium Stabilized stainless steel(347, 316Nb). It seems Nb stabilized grades are more susceptible to hot cracking than Ti stabilized grades. Am I right? If it is, what is the reason...

Thanks a lot. You are right. I knew these but a bad article confused me. By the way, do you know where I can find more information about 316Ti welding?

Who can give me any ideas about reheat cracking and knifeline cracking of stabilized stainless steels such as 347 and 316Ti? These two crackings are same thing or different?

Ed, I have a question for you.You mentioned at another topic about dual certified 316/316L, "...The catch is that neither of these factors helps creap strength or stress rupture. They only increase the low temperature properties." As I mentioned above, ... For 316L it shall not be used over...